As anyone reading here knows, I've had a really frustrating couple of weeks since buying a Rogue preamp and Khartago amp. After much weeping and gnashing of teeth, I finally think everything is working as it should. I was able to run down the noise problem to a dirty switch in the preamp. Right up 'till yesterday morning, I was convinced the problem was in the amp. What's happened since I cleaned up the offending switch? I'll tell you what's been happening, I've been enjoying some of the sweetest music I've ever heard, the Khartago is playing a big part of it. I would recommend anyone interested in this amp to run it with a tubed preamp. The music in my basement is delicate, dynamic, detailed and utterly musical. I'm hearing the full sweetness of the preamp coupled with detail and nuance to die for. $750 new? They must be kidding. I've had amps three or four times the price [quite a few actually] that never made the music this combination does. The Khartago just has an easy way with the notes. The music is emotional and totaly involving. What more can you ask for from an amp?